Coagulation Effects of Sodium Pyrophosphate on Silver Halide Sols in Statu Nascendi

The effects of electrolytic coagulation of hydrophobic sols of silver halides in statu nascendi by aqueous solutions of sodium pyrophosphate have been investigated. The precipitation system AgNO3-Na4P2O7 shows one maximum. The height of this maximum depends strongly on the concentration of the lattice forming ions. When nitric acid is added and the concentration of AgNO3 is held constant the maximum shifts to higher pyrophosphate concentrations

Coagulation Effects of Sodium Pyrophosphate on Silver Halide Sols in Statu Nascendi

The effects of electrolytic coagulation of hydrophobic sols of silver halides in statu nascendi by aqueous solutions of sodium pyrophosphate have been investigated. The precipitation system AgNO3-Na4P2O7 shows one maximum. The height of this maximum depends strongly on the concentration of the lattice forming ions. When nitric acid is added and the concentration of AgNO3 is held constant the maximum shifts to higher pyrophosphate concentrations

Methorics of Coagulation Processes. XIII. Systematic Comparison of Coagulation Values for Various Cationson Negative Silver Halogenide Sols*

The results on coagulating effects of the following electrolytes are reported: on negative silver bromide sol: HNO3, LiNO3, NaNO3, KNO3, H2S04, Li2SO4, Na2SO4, K2S04, Mg(NOAl2, Mn(N03)2, Ca(NO3)2,Sr(NO3)2, Ba(NO3)2, MgSO4, MnSO4, CaSO4, Al(NO3)3, Ce(NO3)3, La(NO3)2; on negative silver iodide sol: LiNO3, NaNO3, KNO3,H2SO4, Li2SO4, Na2SO4, K2SO4, Mg(NO3)2, Mn(NO3)2, Ca(NO3)2, Sr(NOa3)2, Ba(NO3)2, MgSO4 , MnSO4, CaSO4, Al(NO3)3, La(NO3)2 and Al2(S04)3; on negative silver chloride sol: KNO3, Mg(N03), Ca(NO3)2, Sr(NO3)2, Ba(NO3)2, MgS04, CaSO4, Al(N03)3, and La(NO3)3 . As shown earlier a linear relationship exists between the crystallographic radii of the counterions of the same valency and the logarithms of the corresponding coagulation values; the characteristic coagulation values obtained when extrapolating the straight lines of the preceding plots to the zero radius were used for testing the validity of expression for quantitative interpretation of the Schulze- Hardy rule. The equations which follow from the theories of Freundlich and Verwey and Overbeek did not fit the experimental observations, while the equations of Whetham and Tefak showed quite a good agreement

Methorics of Coagulation Processes. XIII. Systematic Comparison of Coagulation Values for Various Cationson Negative Silver Halogenide Sols*

The results on coagulating effects of the following electrolytes are reported: on negative silver bromide sol: HNO3, LiNO3, NaNO3, KNO3, H2S04, Li2SO4, Na2SO4, K2S04, Mg(NOAl2, Mn(N03)2, Ca(NO3)2,Sr(NO3)2, Ba(NO3)2, MgSO4, MnSO4, CaSO4, Al(NO3)3, Ce(NO3)3, La(NO3)2; on negative silver iodide sol: LiNO3, NaNO3, KNO3,H2SO4, Li2SO4, Na2SO4, K2SO4, Mg(NO3)2, Mn(NO3)2, Ca(NO3)2, Sr(NOa3)2, Ba(NO3)2, MgSO4 , MnSO4, CaSO4, Al(NO3)3, La(NO3)2 and Al2(S04)3; on negative silver chloride sol: KNO3, Mg(N03), Ca(NO3)2, Sr(NO3)2, Ba(NO3)2, MgS04, CaSO4, Al(N03)3, and La(NO3)3 . As shown earlier a linear relationship exists between the crystallographic radii of the counterions of the same valency and the logarithms of the corresponding coagulation values; the characteristic coagulation values obtained when extrapolating the straight lines of the preceding plots to the zero radius were used for testing the validity of expression for quantitative interpretation of the Schulze- Hardy rule. The equations which follow from the theories of Freundlich and Verwey and Overbeek did not fit the experimental observations, while the equations of Whetham and Tefak showed quite a good agreement

Metorika koagulacionih procesa III. Utjecaj koncentracije vodene otopine torijeva nitrata na koagulaciju srebrnog bromida in statu nascendi

lspitivan je utjecaj otopine torijeva nitrata na koagulaciju solova srebrnog bromida in statu nascendi. Manje koncentracije torijeva nitrata (cca 1 . 10-5 n) koaguliraju negativni sol srebrnog bromida, dok vece koncentracije izazivlju promjenu naboja i stabilizaciju sola. lzgled cjelokupne krivulje ovisan je o koncentraciji vodikovih jona. Utvrden je narociti utjecaj koncentracije ishodne otopine torijeva nitrata (otopine iz koje je pripreman gradijent Th(NO3)4 u ispitivanim sistemima) na pocetnu granicu koagulacije

N-ftaloil-glicin-hidroksamska kiselina kao kelator željeza u serumu štakora

The aim of this study was to investigate the activity of N-phthaloyl-glycine-hydroxamic acid (Phth-Gly-HA) as a new iron chelator in vivo to be used in iron overload diseases. After intraperitoneal application of Phth-Gly-HA to male rats (1 mg kg1 body mass) once a day for seven days, iron serum level decreased by 21%, whereas the iron value dropped by 32% in female rats (1.5 mg kg1 body mass). The results indicate that the tested substance has the ability to bind serum iron by complexation. Besides transferrin iron release, mobilization of ferritin iron is also possibleU cilju pronalaženja novog efikasnog kelatora koji bi mogao poslužiti u liječenju bolesti izazvanih viškom željeza, u ovom je radu ispitano djelovanje N-ftaloil-glicin-hidroksamske kiseline (Phth-Gly-HA) in vivo. Istraživan je utjecaj kelatora na razinu željeza u serumu štakora nakon intraperitonealne primjene vodene otopine Phth-Gly-HA (0,1 mg mL1) jednom dnevno tijekom 7 dana. Kontrolne su životinje primale fiziološku otopinu. Kod mužjaka injektiranje test supstancije (1 mg kg1) uzrokovalo je pad serumskog željeza za 21%. Kod ženki je nakon tretmana (1,5 mg kg1) izmjereno sniženje razine željeza za 35%. Rezultati pokazuju da ispitivana supstanca ima sposobnost kompleksiranja serumskog željeza, pretežno transferinskog, ali da postoji mogućnost mobilizacije željeza i iz feritinskih zaliha

Efficient fabrication of high-density ensembles of color centers via ion implantation on a hot diamond substrate

Nitrogen-Vacancy (NV) centers in diamond are promising systems for quantum technologies, including quantum metrology and sensing. A promising strategy for the achievement of high sensitivity to external fields relies on the exploitation of large ensembles of NV centers, whose fabrication by ion implantation is upper limited by the amount of radiation damage introduced in the diamond lattice. In this works we demonstrate an approach to increase the density of NV centers upon the high-fluence implantation of MeV N2+ ions on a hot target substrate (>550 {\deg}C). Our results show that, with respect to room-temperature implantation, the high-temperature process increases the vacancy density threshold required for the irreversible conversion of diamond to a graphitic phase, thus enabling to achieve higher density ensembles. Furthermore, the formation efficiency of color centers was investigated on diamond substrates implanted at varying temperatures with MeV N2+ and Mg+ ions revealing that the formation efficiency of both NV centers and magnesium-vacancy (MgV) centers increases with the implantation temperature.Comment: 12 pages, 5 figure